Medical pen injector



FIG. 1 is a bottom, perspective view of a medical pen injector showing my new design.

FIG. 2 is a top, perspective view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a rear elevation view thereof;

FIG. 7 is a left side elevation view thereof; and,

FIG. 8 is a right side elevation view thereof.

The dashed lines are environment only and form no part of the claimed design. 

CLAIM The ornamental design for a medical pen injector, as shown and described. 